1. Wilmer Eye Institute, Johns Hopkins Medicine, Baltimore, MD
2. National Eye Institute, National Institutes of Health, Bethesda, MD
3. Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Boston, MA
4. Beetham Eye Institute, Joslin Diabetes Center, Boston, MA
5. Department of Ophthalmology, University of Pennsylvania, Philadelphia, PA
6. Retina Consultants of Houston, Houston, TX
7. Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, MI